Question

If we add impurity to a metal, those atoms also deflect electrons. Therefore?

• A. the electrical and thermal conductivities both increase
• B. the electrical and thermal conductivities both decrease
• C. the electrical conductivity increases but thermal conductivity decreases
• D. the electrical conductivity decreases but thermal conductivity increases

Hint:

Adding impurities to a metal generally increases its resistivity, reducing both electrical and thermal conductivities.

Answer 1

The Correct Option is B

The addition of impurities to a metal disrupts the regular lattice structure, increasing resistance and reducing both electrical and thermal conductivities.